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81/5 ÷ 2 = 41/10
10/7 = 13/7
24.3333
Convert the mixed number to an improper fraction and then find the reciprocal (by turning it upside down): 2 7/10 = (2×10+7)/10 = 27/10 → (2 7/10)⁻¹ = (27/10)⁻¹ = 10/27
The reciprocal of -1/10 is -10, and the negative of -10 is 10 .